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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c0ec7823d31d22f57b3ba4baf3fe83e422f5b6e9af6e007b29e7e88c0608a6' 
  AND token = 'dKu2t2cBJVZKpoCw+VfNVE779A2gn7lDrMx0JxIqajQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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