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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a10bc3608f518ef20d8eacc94b0ae0b677aad2f9aa0848e7819ef6c299e8f5' 
  AND token = 'ip1RH2mFioIu/ShvYXAxrJJm+LOWbyYOejl8Poq6v8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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