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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240e224202be9acb93214e1d888b6d25192caa29217bdf097a02177473d6cbf8' 
  AND token = 'E1Au6ifpT2+SS34Zx10HJBxSt+9rpVasqWLq1S0rU20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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