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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1686b5651dd8bef570e4ca56cefd424abe9ac45e1d690049102e997d4e8123' 
  AND token = 'HoG8cd+ipCAHOGSp/XqLZCnp/DPwC6Mhva9laf+AYNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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