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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83abc50204a8801f2718a3a2ffc046582573d2e04906193db6cff4560069c276' 
  AND token = 'JqTIhz08d+iKdBv0PH5sMhxZ1f8yqG7DVTR2N5MqtKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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