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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f511ef3ce193e0e226c40a86f68f04c4ae9d120b92c97b50aeec81b9a33b14' 
  AND token = '/26u6PjwkiywAOcvSXBKtGHNz5CpVuruz4Y/S2eHsFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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