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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007f978b97453d0e940d8504c367e6c0115c63852a93df9c13a06255216c7c0b' 
  AND token = 'aAL+mwEgEvsggl612iH2tYJygVkfXLTAXrbXleP8HQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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