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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e12908063cf4ccb84b4fde9cf2e83a3848493ba2928961b42977c2aef4fee5' 
  AND token = 'CJmYWo6PIfc5LxUp7PKgY3SP2v79796krmduwivCnc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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