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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04df9ec27f5d36e262428a2215336be4085849991711dbb10a04ed10cdf60818' 
  AND token = '6uc8zdlkU9ke/wtETJFiBAGTspKAJWyRApg01jxH1/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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