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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265098c9de131c5f763cf84d1293e216b713353684d70c734c5e763dc1e39150' 
  AND token = 'ukrthJ+A3av1cmhd9+LqUFb5/CU1UKNsQPXMSxTuNg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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