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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eed75b87e2f6d1f602433fe6e7da3cc22d4f35f59a6d25a46263d228cecbeab' 
  AND token = '8x6d7r4QGUcE4pWW9G73ajml/J55pR7gjSiPrlZW/X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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