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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87d32795c14ef5b784e44c6d228b1ad77bf721cc6bda9732cfb424a34347369' 
  AND token = '29u2Zqb5ejMkkIwAgKMECy50Go1bmCqu1SSDS+cH3P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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