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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8149da1f6ab9fda994026ff3214149ed250ff37d591b7cff9967b1e6be4e6c' 
  AND token = 'MZu50zPNCTlxeTg48TXHC338Z9QSZbnsX6NILmJl3k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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