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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f66030a1860ab92209e0a73e391d92dfd64e8f371b2771cff6ac88a8efe8e49' 
  AND token = 'nycREmTpEgF0yInUAF1OmEFklRHBIJ4Kgey2VByLffA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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