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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69da762e436c772280a2fe68ee0850bd64d9e44c24f3711e2480b7ff2fad2b23' 
  AND token = '/KEEILC4x2VS5AuP8yqPOv0RrT4sihZALvc/cOVciD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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