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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d8c65e92e42f73b3ffba107ccbbcf235d629da398f37c48f61412097b49460' 
  AND token = '0lifoGwHqHnqap4zHp7j7cRbDkrsXLae6e80Qm8TfKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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