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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b54f1c4203e74b030f271ae9459714b33ac0174323637ae74a11e9676b7470f' 
  AND token = 'DOfTUsGg7dRNvoBH/XS6Xams1+n+6OEUk2Aa3v2DhX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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