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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd20c3b2d97333b08c37430bdd9b9d8396841281a3d57c3b26e27d4e1b88de5d' 
  AND token = 'mZ4MErtbqb/hI/r9VzwLPUwk1jrvYihzKbZ0W8f96EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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