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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bb29bbf52b8e811427176006b35f6fccf9138419b627d198b9e699dc6d04d4' 
  AND token = 'p02EIzRGjxFTTuIUcPgfEm4VgnLDhqLUyG4sGdydca0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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