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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc9666f09d3f78ca1f997bbae53349becd6ab8d5787769c248b0f5cf03ad139' 
  AND token = 'NaRi24wgynXP9RKMfg1N8zcQtArKvjnxeqlNucu2QjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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