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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b344bb7429659f56b223313fe42bd3eb505d55e46e340f0f9e204b5aef58f5f' 
  AND token = 'vuYnQyB4LXcaJPWfbYJYQ642QxR+Oq/GGl85WLOLE3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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