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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd9de0dd7f50156174c4e07e7d1e7c76757d69c3eb430b29d602845875c751b' 
  AND token = 'Vvg2oiINfqi9Z3eGFbcpOEFtTEXP2Jh3B1iPYjI3+9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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