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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f2ba91062d313fe58987f84e9a0a89407e9d2fbb33b79f49ade389e6eb8f16' 
  AND token = '4khZrSUnHwNuSWG9/TMXqQe3H+CLlgC+JUnWy8o0qyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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