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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5323907e52066255aa3d4cbe107cd155a881f0a5cf2aa623ac1a1d6fa2c166' 
  AND token = '3YhrQSgE5pBOFioWQ9tiPCD3m4/ZLXHTldXMiq2w/DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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