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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7c6d953d6c528f514a41ee1e9ad7aea6c2ed6025af5239d6abf0b7278ed2e0' 
  AND token = '1nh71tuWgDtptj4nCwCR9qFvIBQZjJSAaK+WSJSFWBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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