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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686d7a3678d13e6c6e477467e3ed663489b9736e832a3f6521ad257dafa7716a' 
  AND token = '4UQlOH88tIW6N9gtSmjqLY1/101ZxgtzgDl9KvjSi74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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