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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c2eaa48500379e3e7afa18c703af61acbc650113f0a21750b12a77d57d8ece' 
  AND token = '7CtuIphJRHP0/hB34KR2PezVWSRwKmAYKN+pJAHc1Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}