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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e953790a8e2e278e424056b20695bc779c6484c196c240f47583576eba327d0c' 
  AND token = 'T62XoCbrVqCqGL8X/rkm4GP1f6Pn8gGKPrHJMGRdp90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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