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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73c566be3bc9f4af3dec81c7677508dd8a60db1f8e5ebdd198449d74a9d0df7' 
  AND token = '1dkSK0ZrSU7v2y/fOTMToP92xDED4yOZlkUXr1/bvLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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