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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83010c3c57aadfd97daf9527699145ac4d3fbde8abb8eb2e090b29a528aa4d4c' 
  AND token = 'ZQGjJ1XulN0hAb7aVR1PwE9zFavq14LvcFL5/15Gxa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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