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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81fe6195e301571f05ba9654dc71638e3ed380e7cff79750300a8bb621160d4' 
  AND token = 'DxiNeWV9vf3VjhZn1cIm1ew3a4GNNFatBLKzDmO3hqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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