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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abf0072b0224c1dda4520034fb4288394bc09798d501d9bbbfe3842d84cc747' 
  AND token = 'Mh9ak1m90UqHmpgyhEaGcQ/HpO8+8qFmRMJgLt9K+GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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