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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63c95bacd368b7c2bf5fdaf1612cd151eb5d7eb44ac6c90872c79946cef4a45' 
  AND token = 'I7ZaeGVBsivv6tNEIaCaDP8Dh/h2qTrr5CL9z72ia9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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