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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d2c516c28e373af42c449a16dc2096c8b278689a1ee037bcde363c0ecda49f' 
  AND token = 'lR+OhUm93dT8uF9LAFHv/WBscrq2ZRNd70CxV1YIQRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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