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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5d3bec7c8659d9646517ae6180711e76f82ba22708b047a501d1554ebab585' 
  AND token = 'TeQsMOFDH0l2yiqTDGj5GIJK7dr7t+bmrmL2SrQiy+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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