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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d6f894f4b4474457cc72f036f070f9ab69938afb015f7807034c5f045fd2cf' 
  AND token = 'P9IBGkAqcABmuOA5wDn5+OwLHezHQ9kV2vCEQwTvxSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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