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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066ecc0eb2fad415087ca8dc8dd2065f7af44d1332ae8117cb348b2298db463f' 
  AND token = '7uR5cZ8S5Nfe0eMr4HhredW/eEnP58D5m4YFfEPMCW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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