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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd468332b5f361e546cb0afb4d4fc864435759f0b1cc7ba447f69eac3e9b38e2d' 
  AND token = 'THLeX4rwfEUUD3BnNu5qyHiWMMiV8MRIGzALjGvdaWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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