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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce59fc1cb867da7d0ac6608aa6a86c351e0648626659099295b0703afd4a8d5' 
  AND token = 'ZTpwsF8gae4u1ruVFBxD7ujYlluWfT4l/cRA9bPKnDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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