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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55611df5526130a1d3231886d285d54556b2bbb61da9ed7f4194695914fd99a' 
  AND token = '/38v/NGX8vhM1inxo8GAfO6yBcBo33LTb2lhr4utWfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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