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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d91f3bf4e045c5e518327c3dbb1aaf46c0c8aa877a41a8c61da25bdd6c5565f' 
  AND token = 'azHX+37JjR4dfaXv1/xBfKxaNH+wr5jjCZMg3fpinE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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