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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4348c50897a2f645f6f0c6e83a4dab83bc80f3349aa77701ed2cee816fb32ea4' 
  AND token = 'z0vadeEGW7Wf0KiysiYHEcPGC+w8EzdvJZgaNLKAaR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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