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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0594f2ed7731b77887f7337919ea5c96822aa2a878c72113325f47672f062eb' 
  AND token = 'ExZBlbxXgTIBrunYhBF1e/LySVyGWu3Yc8/IclJdUlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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