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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585fd453efbdd8523ea4504080fd63912c3b9249c4b20d6330d93305cf3f5231' 
  AND token = 'E8q2mrpsKJfqCrwJ1pLnLmq1AKvV46m2zyxqCvL13DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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