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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb46a9c27bdcbba4ea41d8064ae9d7d6b2e0a4b078f1b6bbbebe680f68616b3' 
  AND token = '5k1B8Qw9c0adwxLkt8M8vN/Kwl4iCeNkIzm3L1Rs3lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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