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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25191c397feeb35f1f9cc22780f35211e62d956cbc17ea02e0668254dc82dc3b' 
  AND token = '4wxCOJpj+l5ixsNGf7xt1TGurWe+8IP3Y35/dmXGHN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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