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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1e2a9b3107ee1a2cea0565d99f196cb422c32adadab7a2c1bf562be9e7bb71' 
  AND token = 'ZFGVl/7yYfAXr5HxRAYJCGZRUofUbyl6jEOiMvi7Yk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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