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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912bb7d5032fd3421ee38efea1f63a9f47720c60d464d5e6c12edcb010f286ca' 
  AND token = 'S61zRRE9q3pN1SJhq2y3t0vTaNv6OIxxvGE4ZE14Cec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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