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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9763988deb3c3a2d25cca3170ca277b6f85f2bbb51edfe1b52ce1f9c098f8513' 
  AND token = 'IqVxyxbkpj2iVmRyK6VRWP++Lvfe/1MF9vWclHbGtD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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