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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1900efb9fd981687acd1d6ac626828457c8d993ec5f6515c736306bb7be6204f' 
  AND token = 'mKxhem5uQRHI9YahRRLQ23e8WFODsJX2RUUqHVQYP4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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