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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e4b0c62d55d134feecdb206a70717f12f0e9d65a4e16cd1f9a72fb0d1a080a' 
  AND token = 'ff4BNSlR80QffmQq9JDZOd6wSnveD3YxFVdP/rxgLYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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