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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c85fc340c40c5b0521910c34b7d6a6809eed9a79d29fd9e358fdaf83f090102' 
  AND token = '7ZfBRRdNh0AsaOBDwxb8IQ/8Z4Zwb7uqOZSJeA5Tm0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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