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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce6e007fe5d10cc3ae181a6b8b9321a9619ba8dfc0c2019e457b3446cefcd96' 
  AND token = '8TxkP1NYRim5cw9w3g09juwRP+6pC+aI5vxxpcrGJhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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