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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9298dc19a5f69f044b7300b0616c5ebd783efb89ed053fb337e9c053cf4cc36c' 
  AND token = 'PTn6/jA4nr2Fcl7nJandgckRAtI51Z440d8RfBNqiR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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