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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f63d90ad8587dc03eee2b6bb761045c4e913294cc10799a4cada9dbb9d7f2e0' 
  AND token = 'oixJYzMF62W2svPWhah8f/GHIr5d0xIiKEdn8XqrE/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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