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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0119e770c3e51f715bf67ff378f18c8c95351b76b6eb80ed58310d1f0ae5f2' 
  AND token = 'xebj69b9sKgZghn84Cx5xKuWDA9umSuHI4Pd6gvt8vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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