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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '500bcd55a2b3321ef87f4c61616d07ff4490b6c315dc6337c3c17d4dbb7f0394' 
  AND token = 'gXuP4UqkV4jieBUXmPkRoNksAV7OjNOBbSWjdVth9GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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