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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4df38c1d5cf2510bd3f80bc91d4ccc1f5f28187b688bcfb1c6e9e5d9eb6e9e' 
  AND token = '6/6YXnr02uuTYxiSlO/64sugFpYO08lXULk2aN5AoBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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