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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b44fb23ca7c202ae63a9dc564fd65877efa927ae5dc0539b0c991c93d4ad76' 
  AND token = 'G274uiOkQVOa+2griD5/IjBb6Jt6XrilbM684bHxNzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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