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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c39ec25a34504514eec8bf31ea75a3f76fd4f38f2247b740dd5782cdeb60273' 
  AND token = 'Rcqa/kySgVkWmS1FyqaP6ezyWHe6pHiR0JnsKI6KrkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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