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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e18b77764b9ef72128b9122e979a4547a6d19e4f9d7e2d62c6a56e1a3c3adc' 
  AND token = 'j7jy0+PaXK5FPIv2yBXk4jqprOWmURydC4kVYan9r0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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