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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28850124717a14f1f76b5ba7f9c5a58de2c0a266b05d4f8e1451fb83e151c188' 
  AND token = 'Mc8IHUt71VHWS3wqb1FiUqojLjquVZMS7O34haGUJlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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