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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b84a5c0c04ae5b760f52bb16ad9518606fb76c63d61eae37cafb5b537e193a' 
  AND token = 'viP1PVkplN1rfB/CTiXyCaXK3NnMPy7eGOMSkyTatXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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