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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb58e89e7e6700f8b30111c736c432b7c47d02e885cf017f5b9e0ed69faf92d' 
  AND token = 'g3PUSijVzBUM5MH2qx8U/eB6EY0Uyop1iqyMODDHfzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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